Hi, using Qtek 2020 since more than 1 year. Positive - it works, slowly, but it works Negative - screen difficult to read in sunlight - slow and crashes using TOMTOM and phone at same time - synchronising works in principle, but difficult to set properly (files e.g.) 2 times in 1 year: all data were "rewritten" because not "recognized", which leads to duplicates and some losses. - fragile and slipery case (the one of S200 in rubber type is ways better) - big size - battery time limited (this gets obvious with older batteries) it was the best on the market 1.5 years ago and is still ok, but.... time to look for something faster and smaller ...

It's my best cell phone I have ever have.But I just don't know how I could upgade it's windows.

I could upgrade it. You can contact me, then I will tell u how.